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That's your case vent tube.....
Usually isn't a problem unless the rotating parts are foaming the trans fluid and throwing it all over the place....how does your trans fluid level look when checked? Overfilling is a common cause of vent tube leakage. Another cause is a leaky converter check, which allows oil from the converter to drain back into the case, raising the level and causing spillage out the vent tube.
I have a similar problem on the race car due to starting line G forces...fluid stacks rearward, gets picked up by trans parts spinning at high rpm and some of the mess goes out the tube. I solved the problem by running a hose to my oil puke tank....since the tank is roughly 13" or so above the vent tube, any ATF thrown out usually rises in the hose and then drops back. Haven't seen any show up in the puke tank.
Usually isn't a problem unless the rotating parts are foaming the trans fluid and throwing it all over the place....how does your trans fluid level look when checked? Overfilling is a common cause of vent tube leakage. Another cause is a leaky converter check, which allows oil from the converter to drain back into the case, raising the level and causing spillage out the vent tube.
I have a similar problem on the race car due to starting line G forces...fluid stacks rearward, gets picked up by trans parts spinning at high rpm and some of the mess goes out the tube. I solved the problem by running a hose to my oil puke tank....since the tank is roughly 13" or so above the vent tube, any ATF thrown out usually rises in the hose and then drops back. Haven't seen any show up in the puke tank.